Cushion handle



Feb. 16 1926. 1,573,458

w. A. SMITH CUSHION HANDLE Filed March 13, 1925 INVE:VTOR. IYEZMumH-51120471,

BY {g7 I, H/s ATTNEY Patented Feb. 16, 1926.

UNITED ST'A TES PATENT .OFFICE.

WILLIAM A. SMITH, 0E A'rnENs, PENNSYLVANIA, ASSIGNOB, To INGEBSOLLRAHDCOMPANY, or master our, NEw JERSEY, A CORPORATION or New JERSEY.

CUSHION HANDLE.

Application filed March 1a, 1925. Serial No. 15,302.

To all whom it may concern:

Be it known that I, WILLIAM A. SMITH, a citizen of the United States,and a resident of Athens, county of Bradford, State of Pennsylvania,have Cushion Handle, of which the following 15 a specificationaccompanied by drawings.

This invention relates to fluld actuated rock drills, and moreparticularly to cushion handles for. that type of rock drill which 1ssupported and guided by the operator.

One object of the invent1on is to prevent excessive shocks and vibrationset up 1n the machine from being transmitted to the uiding handle of themachine. Another 0 ject is to produce a cushioned handle for a rockdrill which is efficient in operatlon and may be readily adjusted toimmediate require ments.

fication and in which similar reference characters refer to similararts, v Figure 1 is a sidevlew in elevation and partly in section, of arock dr1ll equ pped with a cushioned handle constructed 1n accordancewith the practice ofthe mvention, and

Figure 2 is a transverse view partlydn section taken through Figure 1 onthe hne 2-2, looking in the direction of the arrows. Referring to thedrawings, the invention is shown embodied in a rock drill of the handheld type, in which a hammer cyhnder A, a front head B and a back head Oare held in operative position by spring pressed side bolts D. 1

Disposed within .the front head B is a collared drill steel E. A yokedsteel retainer F is supported pivotally by trunnions G on oppositesidesof the front head, and the yoke portion of the retainer embraces thesteel E in advance of the drill steel collar and cooperates therewithfor retaining the drill steel within the front head B. A suitable hammerpiston (not shown) is arranged within the cylinder A and reciprocatestherein for delivering impact blows upon the drill steel E.

Pressure fluid is introduced into the machine through an inlet opening Hand the distribution of the pressure fluid is effected invented acertain by a suitable valve (not shown) within the valve chest J.

In accordance with the practice of the invention, a handle is providedwhich cooperates wlth a pair of cylinders K arran ed independently ofeach other on the back head C, and provided with lateral flanges L whichserve as a base for the cylinders. In this instance the cylinders K areheld against longitudinal movement by the bolts D which extend throughholes 0 of the flanges L.

Arranged within the bore P of the cylinders K are a pair of plungersQhaving a bearlng portion 3 and a reduced extension S. In this instance,the extension S is threaded at its end to receive a nut T. The opposlteend of the plunger Q terminates in a circular flange U having alongitudinal bore V. Hollow sleeves W abut the outer faces of theflanges U. A similar sleeve X of suitable length is interposed betweenthe flanges U and serves as a spacer for holdin the plungers Q, andconsequently the cylinders K, in proper relation with each other. Inthis instance, a bolt Y extends through the sleeves W and X and theholes V of the flanges U and 'is provided with a suitable nut Z forclampin said sleeves firmly together, to form the andle for manipulatingthe machine.

In order to cushion the relative longitudinal movement between theplungers Q and the cylinders K in one direction, springs 11 are disposedwithin the bore P of the cylinders K. One end of said springs bearsagainst a face 0 of the plunger Q, and the other end bears against thebottom Wall (Z of the cylinder bore P. Similar springs c are arrangedbeneath the cylinders K and are guided by the extension S to cushion themovement of the plungers in the opposite direction. One end of thesprings e ears against the cylinder Wall (Z, and the other end-of saidsprings rests on the nuts T which also provide a means for adjusting thetension of the cushioning springs 72 and e. In this instance, the nut Tis held against accidental removal by a pin f extending transverselythrough the extension S near its end.

The above described cushioned handle has been found to be veryefficient, and the parts constituting the handle, as well as thesprings, may readily be removed or may be replaced by removing the nutsT and without disturbing the assembly of the machine. a

I claim":

1. In a cushioning device for rock drills, the combination of a backhead, cylinders formed separately and mounted on said back head,plungers to reciprocate within said cylinders, spring pressed side boltsfor securing the cylinders to the back head, a pair of springs of equaldiameter associated with each plunger to cushion longitudinal movementof the plungers in both directions, and a handle-supported .by theplungers for guiding the rock drill and holding the cylinders againstrotation with-respect to said back head.

2. In a cushioning device for rock drills, the combination of a backhead, a pair of cylinders secured removably to the back head, a lateralflange on each cylinder, spring pressed side bolts to cooperate with thelateral flanges for securing the cylinders to the back head, plungers toreciprocate Wltlllll the cylinders, a pair of springs of equal diameterassociated with each plunger for cushioning relative longitudinalmovement between the plungers and the cylinders in both directions, anda handle secured to one end of the plungers for guiding the rock drilland for holding the cylinders against rotative movement with respect tothe back head.

3. In a cushioning device for rock drills, the combination of abackhead, a pair of independent cylinders supported by the back head, alateral flange on each cylinder,

' spring pressed side bolts extending through the lateral flanges andthe back head for securing the cylinders to the back head, plungers toreciprocate within the cylinders,

said plungers having a reduced forward extension, springs within thecylinders to cushion the movement of the plungers in one direction,springs beneath the cylinders to cushion the movement ofthe plungers inthe opposite direction, nuts on said excylinders formed separately andmounted on said back head, a lateral flange on each cylinder, springpressed slde bolts on opposite sides of the rock drill extending throughthe back head and the lateral flanges for securing the cylinders to theback head, plungers to reciprocate Within the cylinders, reduced forwardextensions on the plungers, springs in the cylinders and on theextensions for cushioning the movement of the plungers in one direction,springs beneath the cylinders and on the extensions for cushioning themovement of the plungers in the opposite direction, nuts on an end ofsaid extensions for holding the plungers and springs in operativeposition and for simultaneously adjusting the tension of the springs onthe extensions, and a handle connecting the plungers for holding thecylinders against r-otative movement with respect 30 tile back head andfor guiding the rock ril specification.

WVILLIAM A. SMITH.

